hi my brother has created a program called 'guess my number' (see it here: http://www.naughtyottselprograms.tk/)

and i know the coding that i need but i dont know if there is a module that includes numbers

does anyone know the name for that module if it exists?

You will need to import the random module for the computer to pick a number. Apart from that you won't need anything else. You can Google for your guess my number program. There should be plenty in Python.